#include"dos.h"
#include"conio.h"
#include"string.h"
#include"stdio.h"

#define normbut_bor 0x80
#define presbut_but 0xb8
#define normnum_but 0x8e
#define presnum_but 0xb9
#define spebut_char 0x2c
#define win_color   0xf2
#define win_char    0xfb

struct s_button   /*按键的结构体*/
{   int sx,sy,ex,ey;
    char *head;
    int press;
}button[17];   /*图表按键数*/

struct stack   /*结构体栈*/
{   char s[20];
    int tos,top;
}stack;
char tag;
{
    if(stack.tos>0)
        stack.s[--stack.tos]='\0';
}
draw_win()   /*边框画线窗口*/
{
    int i;
    char far *t;
    char *s="This is a simple calculator!";   /*顶端边框输出的字符*/
    draw_border(30,0,79,24,win_color);   /*边框的位置和颜色*/
    i=(79-30-strlen(s))/2+30;
    t=vid_mem+i*2;
    for(;*s;)
    {
        *t++=*s++;
    *t++=win_color;  /*顶端字体颜色*/
    }
 
}
draw_border(int sx,int sy,int ex,int ey,int attrib)   /*边界线函数*/
{
    char far *t,far *v;
    int i;
    t=vid_mem;
    for(i=sx+1;i<ex;i++)
    {
        v=t+sy*160+i*2;
    *v++=196;   /*每一行上画线确定为直线*/
        *v=attrib;
        v=t+ey*160+i*2;
    *v++=196;  /*每一行下画线确定为直线*/
        *v=attrib;
    }
    for(i=sy+1;i<ey;i++)
    {   v=t+i*160+sx*2;
        *v++=179; /*每一列左画线确定为直线*/
        *v=attrib;
        v=t+i*160+ex*2;
        *v++=179;  /*每一列由画线确定为直线*/
        *v=attrib;
    }
    write_char(sx,sy,218,attrib);
    write_char(ex,sy,191,attrib);
    write_char(sx,ey,192,attrib);
    write_char(ex,ey,217,attrib);
}
write_char(int x,int y,char ch,int attrib)   /*字符输入函数*/
{   char far *v;
    v=vid_mem;
    v+=x*2+160*y;
    *v++=ch;
    *v=attrib;
}
active_button()/*图表按钮设定函数*/
{   int i;
    make_button(0,32,9,38,11,"1");/*每个键对应的位置和数值*/
    make_button(1,42,9,48,11,"2");
    make_button(2,52,9,58,11,"3");
    make_button(3,62,9,67,11,"+");
    make_button(4,71,9,76,11,"-");
    make_button(5,32,12,38,14,"4");
    make_button(6,42,12,48,14,"5");
    make_button(7,52,12,58,14,"6");
    make_button(8,62,12,67,14,"*");
    make_button(9,71,12,76,14,"/");/*“/”的位置*/
    make_button(10,32,15,38,17,"7");
    make_button(11,42,15,48,17,"8");
    make_button(12,52,15,58,17,"9");
    make_button(13,62,15,67,17,"=");
    make_button(14,71,15,76,17,"<-");
    make_button(15,32,18,38,20,"0");/*“0”的位置*/
    make_button(16,71,18,76,20,"End");
    for(i=0;i<17;i++)
    {
        draw_border(button[i].sx,button[i].sy,button[i].ex,button[i].ey,normbut_bor);
    }
    for(i=0;i<17;i++)
    {
write_top(button[i].sx+1,button[i].sy+1,button[i].ex-1,button[i].head,normnum_but);
    }
}
write_top(int x1,int y,int x2,char *s,int attrib)
{
    char far *v,far *t;
    int i;
    v=vid_mem;
    for(i=x1;i<=x2;i++)
    {   t=v+y*160+i*2;
        *t++=' ';
        *t=attrib;
    }
    i=(x2-x1-strlen(s)+1)/2+x1;
    t=v+160*y+i*2;
    for(;*s;)
    {   *t++=*s++;
        *t++=attrib;
    }
}
text_clo()  /*文本光标*/
{   tx--;    /*光标向左移*/
    if(tx<32)tx++;   /*backspace时X不能小于32*/
    put_char(tx,ty,'');
}
put_string()  /*计算机运算函数*/
{   float result;
    tx=32;
    switch(tag)  /*根据运算符号计算*/
    {
    case '+': result=v1+v2;break;  /*做加法*/
    case '-':result=v1-v2;break;  /*做减法*/
    case'*':result=v1*v2;break;  /*做乘法*/
    case '/': result=v1/v2;break;  /*做除法*/
    default :result=v1;   /*若不计算输出0*/
    }
    sprintf(stack.s,"%.3f",result);   /*输出结果保留小数点后三位*/
    while(stack.s[stack.top])
    {   put_char(tx,ty,stack.s[stack.top++]);
        tx++;
    }
}
send1()  /*向服务器发送请求*/
{   sscanf(stack.s,"%f",&v1);  /*输入并储存在V1中*/
    clear_stack();  /*清除栈*/
}
send2()  /*向服务器发送信息*/
{   sscanf(stack.s,"%f",&v2);
    clear_stack();   /*清除栈*/
}
select_but(int x,int y)   /*选择按钮*/
{   int num;
    if(y>2)
        if(x<2)num=15;
        else num=x+5*y;
    draw_border(button[num].sx,button[num].sy,button[num].ex,button[num].ey,presbut_but);
    write_top(button[num].sx+1,button[num].sy+1,button[num].ex-1,button[num].head,presnum_but);
}
                write_top(button[num].sx+1,button[num].sy+1,button[num].ex-1,button[num].head,normnum_but);
     }
     else
     {
        draw_border(button[num].sx,button[num].sy,button[num].ex,button[num].ey,normbut_bor);
        write_top(button[num].sx+1,button[num].sy+1,button[num].ex-1,button[num].head,spebut_char);
     }
}
put_char(int x,int y,char ch)   /*计算窗口的输入确定函数*/
{
    char far *v;
    v=vid_mem;
    v+=x*2+y*160;   /*光标的位置*/
    *v++=ch;   /*输入字符随光标的推进*/
    *v=0xf0;  /*输入数字的颜色*/
    window_xy(x,y);  /*光标在窗口坐标*/
}
calculator()  /*计算器构成的函数*/
{
    int a,b;
    key_choice();  /*键选择函数*/

}
menu()   /*左边窗口函数*/
{   char *j="This is a calculator!\nConductor Teacher:\nCheng YaHui\n\nStudent:Chen ChunLin\nNumber:0841330197\nSchool:ShaoYang College” "
    char *s="Use Guide:\nInput the number from\n the keyborde"
    draw_border(0,0,29,24,win_color);  /*左边框的位置和颜色*/
    write_top(1,2,28,"Introduction",0xf9);/*INTRODCTION的位置和颜色*/
    write_text(2,5,j,0x79);  /*输入字符的位置和颜色*/
    write_text(2,17,s,0x79);  /*输入字符的位置和颜色*/
}

main()
{
    init_stack();
    vid_mem=(char far *)0xb8000000;
    if(!form_win())
    {
        printf("can't form the device,press any key to leave!...");/*如果不能显示见面窗口，按任意退出。*/
        getch();
        exit();
     }
    menu();
    calculator();
}

main()
{
    init_stack();
    vid_mem=(char far *)0xb8000000;
    if(!form_win())
    {
        printf("can't form the device,press any key to leave!...");/*如果不能显示见面窗口，按任意退出。*/
        getch();
        exit();
     } menu();
    calculator();
}